Improvement in steam-generators



5 Sheets-Sheet 1Q J. HARRISON, Jr.

STEAM GENERATOR.

Patented Aug. 8, 1865.

W zaww 5 Sheets-Sheet 2 J. HARRISON, Jr. STEAM GENERATOR.

Patented Aug. 8 I865.

J. HARRISON, J

5 Sneezs-L-Sneet 3.

STEAM GENERATOR.

No. 49,263. Patented Aug. 8, 1865.

5 She ets-sheet 4 J. HARRISON, J1.

STEAM GENERATOR.

No. 49,263. Patented Aug. 8, 1865.

5 Sheets Sheet 5.

J. HARRISON, Jr.

STEAM GENERATOR.

No. 49,263. Patented Aug. 8, 1865.

UNITED STATES PATENT OFFICE.

IMPRQVEMENT IN STEAM-GENERATORS.

Specification forming part of Letters Patent No. 49,263, dated August 8,1865,

To all whom it may concern:

Be it known thatI, JOSEPH HARRISON, J r., of the city of Philadelphiaand State of Pennsylvania, have invented a new and Improved Mode ofConstructing Steam-Generators, with the object of making them more safefrom-explosion and more economicalin first cost, in repairs, and in fuelconsumed than those generally in use. l i

-To enable others skilled in the art to make and use my'invention, I dodeclare that the following is a full and exact description, to Wit:

Refcrring'to the drawings and specification of a patent granted to mefrom the United States Patent Oflice, dated October 4,1859, upon whichthis is an improvement, I in that case take any number ofsphericaltchambers or other analogous form cast in groups, connected bycurved necks, their joints held together by tie rods or bolts. In thepresent instance I omit the tie rods and jointsaltogether orin part; andfor the'purpose of making what I calla slab or section of a boiler Iordinarily make the entire slab in one piece, either by casting orotherwise, as I may deem best,

Drawing No. 1 shows in section a slab or section of a boiler ofsixty-four hollow spheres, each of about eight inches exterior diameter,and of any required thickness, made in a single piece. At both ends ofthe slab are openings closed by caps, as shown, these openings beingneeded in casting for supporting and venting the cores, and also forcleaning the boiler when in use. a a a a are transverse openings throughthe slab, hereinafter to be explained.

Drawing No. 2, Figure 1, shows the exte= ,rior form of a slab, of whichDrawingNo. lis

a section cut through its plane,- and shows also openings at a a a a,and caps closing the openings in the ends of'the slabs, as in DrawingNo. 1.

Drawing No. 2, Fig. 2, shows an end view of three slabs, part insection, and shows also the mode of connectingthe slabstogetherforforming asteam-generator. Any number of these slabs may beset vertically edgewise beside each other, and in any required; positionas to their lengthwise direction. Between the slabs the openingsdescribed in Drawing N o. 1 and in Drawing No. 2, Fig. 1. Thesecastingsare fitted to the slabs so that when drawn together by thebolts bbthejoints-become-tight and the intervened castings form asteam-connection at or near the top and'a waterconnection at or near thebottom of the series of slabs, and can be also used for other water andsteam attachments by branches that maybe affixedn In practice, rigidityis found objectionable in the cross-connections for water and steambetween the slabs, for the reason that unequal expansion of thediiierent parts tends to impair the tightness of the joints when rigid.

By reference to Drawing No. 3, which is made about one-half the workingsize, it will beiseen thatthe joints. on the.slahsandintermediate'pieces a a a have a curved or spherical line struckwith radii thatproceed from b b i b, the centers of the spheres, bymeans of which a slight variation in the slabs resulting from unequalexpansion is accommodated, for,

although there may. occurso me movement of 1 the surfaces at the joints,they would still re-' slabs,dispensing thereby in part oraltogether withthe use of a brick covering.

0n Drawing No. 2, Figs. 1 and 2, is shown in outlines and color the modeof arranging these webs.

Drawings Nos. 4 and 5 show side and end views of ordinary modeofsettingmyimproved boiler, in which it will be seen that the interior ofthe spheres and their connecting-necksare filled with water up tothejwater -line, while that portion of the spheres above the waterlinein each slab constitutes the steam chamber, the slabs being connected,as above exzat one or more corners or at any otherpoints J plained, bywater and steam communications are to'.be placed the castings ad a a,against with the heat generated in :the furnace, the

gases before entering thechimney are made to v pass out of the slabs attheir lowest point, as shown by the arrow at the outlet iu'Drawing No.5.

In pu ttiug the slabs together to form a steamgenerator, I intend tocombine them in such manner and to strengthen them by such means as maybest suit the peculiar circumstances of the case, whether made up into acompact mass or in chambers or fluesforming in their combination anefficient steam-generator.

Should singleslabs be required containing a greater number of spheresthan can be cast'or' handled with facility in one piece, then I proposeto make such slabs in parts as large as may be most convenient, theparts to be formed into entire slabs by means of joints and bolts, asdescribed in the specification of patent granted to me by the UnitedStates October 4, 1859, or other devices, as maybe best suited I to thepurpose. v

What I clalmas new in the above specifica- -tion iscurved surfaces atthe joints, in the mod'e'and for the object set forth, or in any othermanner substantially the same for.accomplishing the like purpose.

3. The manner-ot'combining the thin web with the spheres, as described,for the purpose of making a ti ght wall or casing for boilers, in thesetting of which it is desired wholly or in part to'dispeuse withbrick-work JOSEPH HARRISON, JR. Witpesses:

SAML. HARRISON, I. WALTERMURPHEY.

